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Total 28 documents matching your query.

1. [AMPS] 4CX1000A (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 1 Jun 1999 02:51:46 -0700; To check the ceramic-metal seals, High-pot the tube at c. 6kV. I would be suspicious of more than approx. 10uA of leakage. - good luck, Ron Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/; /archives//html/Amps/1999-06/msg00001.html (6,957 bytes)
2. [AMPS] 4CX1000A (score: 1): Author: feutz@wctc.net (Ron Feutz); Date: Mon, 31 May 1999 21:28:04 -0500; I have a 4CX1000A with socket. It has never been in service. I've had it for about 18 years or so. I want to find a plan for a single band 160M amp using this tube, or would consider selling it. I ne; /archives//html/Amps/1999-05/msg00001.html (6,147 bytes)
3. [Amps] 4CX1000A (score: 1): Author: "Paul Young" <paul@g0hwc.com>; Date: Mon, 7 Jan 2008 16:53:07 -0000; Hi all, I have got a pair of 4CX1000a tubes in boxes that have been in the loft for 20 years. I am looking at selling one but would like to test first. Is there a simple test I can do on them ? they; /archives//html/Amps/2008-01/msg00074.html (6,436 bytes)
4. [Amps] 4CX1000A (score: 1): Author: "juan carlos ruffo" <RUFFOJUAN112@HOTMAIL.COM>; Date: Thu, 22 May 2008 17:29:47 -0300; NECESITO INFORMACION ACERCA DE UN YUBO 4CX1000A FUNCIONSNDO EN CLASE C MODULADO EN PLACA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.; /archives//html/Amps/2008-05/msg00172.html (6,267 bytes)
5. [Amps] 4CX1000A (score: 1): Author: "Roger Dixon" <lists@irdixon.plus.com>; Date: Fri, 27 Jan 2012 12:45:04 -0800; Hi Chaps, I recently completed my 50MHz 4CX1000A amplifier. However the Eimac pull I have had for a while suffers from excessive secondary emission. The question. I have recently obtained a NOS 4CX10; /archives//html/Amps/2012-01/msg00214.html (9,085 bytes)
6. Re: [Amps] 4CX1000A (score: 1): Author: Mark K5AM <k5am@zianet.com>; Date: Fri, 27 Jan 2012 21:00:38 +0000; Roger, This is a common problem, but may have solutions. It would be interesting to hear the details. All parameters, level of drive, duty cycle, grid current, ALC details if used, screen supply deta; /archives//html/Amps/2012-01/msg00215.html (9,458 bytes)
7. Re: [Amps] 4CX1000A (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 27 Jan 2012 16:23:17 -0500; Are you familiar with Tetrode tuning? At what level of screen current do you start getting secondary emission? I've not heard of any problems with GE constructed 4CX1000A's. GE has built a lot of hig; /archives//html/Amps/2012-01/msg00216.html (10,013 bytes)
8. Re: [Amps] 4CX1000A (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 27 Jan 2012 16:32:22 -0500; I forgot to mention that most of these tubes run reverse screen current with low drive and power levels. Mine (4CX1500B/FU728F) only goes to positive screen current near the US legal limit output. At; /archives//html/Amps/2012-01/msg00217.html (9,695 bytes)
9. Re: [Amps] 4CX1000A (score: 1): Author: donroden@hiwaay.net; Date: Fri, 27 Jan 2012 15:58:23 -0600; A bleeder resistor to ground at the tube screen connection should help. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2012-01/msg00218.html (9,957 bytes)
10. Re: [Amps] 4CX1000A (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 27 Jan 2012 17:10:56 -0500; This not only makes the regulated supply much more simple as the supply always sees a positive load. The value of the resistor should be of such that the supply always sees a normal load that never g; /archives//html/Amps/2012-01/msg00219.html (9,898 bytes)
11. Re: [Amps] 4CX1000A (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 27 Jan 2012 18:17:15 -0500; The 3 didgit EIA code on the tube will tell you who actually built it. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mail; /archives//html/Amps/2012-01/msg00220.html (11,121 bytes)
12. Re: [Amps] 4CX1000A (score: 1): Author: "Val" <val@vip.bg>; Date: Sat, 28 Jan 2012 19:57:20 +0200; Don, How the bleeder resistor would help, if the reverse current exceeds 37 mA? At 325 V screen voltage this makes 12 W - the maximum screen dissipation. I have seen many brand new tubes with much hi; /archives//html/Amps/2012-01/msg00228.html (10,107 bytes)
13. Re: [Amps] 4CX1000A (score: 1): Author: Mike Tubby <mike@tubby.org>; Date: Sat, 28 Jan 2012 18:11:28 +0000; Val, With a tetrode your screen supply must be able to source and sink current wile maintaining regulation of the voltage at the screen. One way of doing this is with a series-regulator and a bleed r; /archives//html/Amps/2012-01/msg00229.html (12,000 bytes)
14. Re: [Amps] 4CX1000A (score: 1): Author: "Val" <val@vip.bg>; Date: Sat, 28 Jan 2012 21:43:43 +0200; Mike, Thank you very much for the explanation. I completely agree. The question is how a tube, showing maximum reverse screen current leading to an excessive screen dissipation could be used in an am; /archives//html/Amps/2012-01/msg00230.html (13,024 bytes)
15. Re: [Amps] 4CX1000A (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 28 Jan 2012 15:23:00 -0500; I'm not mike, but I think the reverse screen current is not strictly normal, in a perfectly built tube you should see none. These tube are built with the screen grid components hiding in the electron; /archives//html/Amps/2012-01/msg00231.html (10,387 bytes)
16. Re: [Amps] 4CX1000A (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 28 Jan 2012 16:12:14 -0500; Typically all I've used ran well at reduced power levels even with reversed screen current, but I've never seen a need for running an amp at less than half to three quarters power. The idea just neve; /archives//html/Amps/2012-01/msg00233.html (11,397 bytes)
17. Re: [Amps] 4CX1000A (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 28 Jan 2012 16:33:33 -0500; I suggest reading page 4 and 5 in the below link. http://www.g8wrb.org/data/Eimac/4CX1000A.pdf And then tell me its not perfectly normal. Most external anode tetrodes Im familiar from the 4X150A to 4; /archives//html/Amps/2012-01/msg00235.html (11,166 bytes)
18. Re: [Amps] 4CX1000A (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 28 Jan 2012 17:14:35 -0500; I stand by my statement, "in a perfectly built tube you should see none" and "is not strictly normal" You say: "Most external anode tetrodes I'm familiar from the 4X150A to 4CX1500B can exhibit negat; /archives//html/Amps/2012-01/msg00236.html (11,616 bytes)
19. Re: [Amps] 4CX1000A (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 28 Jan 2012 18:22:36 -0500; We are discussing medium power tubes, not ones with handles. If you check the specs carefully you will see that reverese screen current isnt even mentioned with the big tubes. I specifically listed a; /archives//html/Amps/2012-01/msg00237.html (12,575 bytes)
20. Re: [Amps] 4CX1000A (score: 1): Author: donroden@hiwaay.net; Date: Sat, 28 Jan 2012 18:35:20 -0600; Ahhhhh parallel / series OB2 s Them wuz the days........ Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a; /archives//html/Amps/2012-01/msg00238.html (9,469 bytes)

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